package org.javascud.extensions.zookeeper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;

import java.util.Map;

/**
 * Property Manager.
 * <p/>
 * You can add/update/remove a property.
 *
 * @author Felix Zhang  Date: 2010-9-30 15:27:04
 */
public class PropertyCenter
{
    private static final Log log = LogFactory.getLog(PropertyCenter.class);

    private ZooKeeper zk;
    private String charset = "UTF-8";
    private String root = "";

    public void setZooKeeper(ZooKeeper zk)
    {
        this.zk = zk;
    }

    public void setCharset(String charset)
    {
        this.charset = charset;
    }

    public void setRoot(String root)
    {
        if(root !=null && root.length()>0)
        {
            if(!root.startsWith("/"))
            {
                root = "/" + root;
            }
            
            this.root = root;
        }
    }

    public boolean createRootNode(String node)
    {
        assert node != null;

        if(!node.startsWith("/"))
        {
            node = "/" + node;
        }

        try
        {
            Stat s = zk.exists(node, false);

            if (s == null)
            {
                zk.create(node, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            }
        }
        catch (Exception e)
        {
            log.error("update property error: " + node, e);
            return false;
        }
        return true;
    }

    protected String buildName(String name)
    {
        return root + "/" + name;
    }

    public String getStringProperty(String name)
    {
        try
        {
            byte[] data = zk.getData(buildName(name), false, null);
            return new String(data, charset);
        }
        catch (Exception e)
        {
            log.error("read property error: " + name, e);
            return null;
        }
    }

    public byte[] getProperty(String name)
    {
        try
        {
            return zk.getData(buildName(name), false, null);
        }
        catch (Exception e)
        {
            log.error("read property error: " + name, e);
            return null;
        }
    }


    public boolean updateProperty(String name, String data)
    {
        try
        {
            return updateProperty(name, data.getBytes(charset));
        }
        catch (Exception e)
        {
            log.error("update property error: " + name, e);
            return false;
        }
    }

    public boolean updateProperty(String name, byte[] data)
    {
        try
        {
            Stat s = zk.exists(buildName(name), false);

            if (s == null)
            {
                zk.create(buildName(name), data, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            }
            else
            {
                zk.setData(buildName(name), data, -1);
            }
        }
        catch (Exception e)
        {
            log.error("update property error: " + name, e);
            return false;
        }

        return true;
    }

    public boolean deleteProperty(String name)
    {
        try
        {
            Stat s = zk.exists(buildName(name), false);

            if (s != null)
            {
                zk.delete(buildName(name), -1);
            }
        }
        catch (Exception e)
        {
            log.error("delete property error: " + name, e);
            return false;
        }

        return true;
    }

    public Map<String, String> getStringGroupProperties(String name)
    {
        //todo

        return null;
    }

    public Map<String, byte[]> getGroupProperties(String name)
    {
        //todo

        return null;
    }




}
